I'm not sharing the whole email, but here's a snippet:
“In the meantime, I would like you to complete the following tasks and present the information to me as soon as possible. This will form the second part of your interview. “
It's maybe 5h to 7h worth of work. I feel like replying that I don't feel comfortable doing work for free will immediately take me out of the hiring process, but I'm also not a very assertive person, so I'm wondering what would be the best way to word this.